Integrated study of Pt/WO/sub 3//SiO/sub 2/ catalysts for the NO-CO reaction. I. Catalyst characterization by XRD, chemisorption, and XPS

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · J. Catal.; (United States)

OSTI ID:5182477

Regalbuto, J R; Fleisch, T H; Wolf, E E

PtWO/sub 3/SiO/sub 2/ catalysts were characterized by X-ray diffraction (XRD), selective CO chemisorption, and X-ray photoelectron spectroscopy (XPS). It was found that the presence of WO/sub 3/ decreased final Pt crystallite size, in part by reducing the formation of bulk PtCl/sub 2/ precursor. However, CO chemisorption was suppressed; this indicated strong metal-promoter interactions. Changes in Pt electron binding energy suggest that charge transfer may also take place. A model of the surface consisting of Pt crystallites decorated by partially reduced WO/sub x/ is proposed. This morphological model was supported by XRD and XPS results which revealed a surface-localized phase of partially reduced WO/sub x/ (likely WO/sub 2/). Decoration was also indicated in the trend of XPS PtSi ratios

• Research Organization: Univ. of Notre Dame, IN (USA)
• OSTI ID: 5182477
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 107:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

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